diff --git a/src/Proto/Events/DiadocMessage.cs b/src/Proto/Events/DiadocMessage.cs
index 96412981..73319d59 100644
--- a/src/Proto/Events/DiadocMessage.cs
+++ b/src/Proto/Events/DiadocMessage.cs
@@ -209,6 +209,7 @@ public interface IBoxEvent
 		bool HasPatch { get; }
 		Message Message { get; }
 		MessagePatch Patch { get; }
+		string IndexKey { get; }
 	}
 
 	[ComVisible(true)]